Abstract: A storage container adapted, when empty, to be collapsed and folded upon itself for compact storage. The container is composed of a flexible waterproof material having an elongated opening therein. The opening of the container is rendered substantially waterproof by a waterproof tubular portal element which is open at both ends. One end of the element surrounds the container opening and is sealed to the wall of the container, so that access to and from the container is obtained only through the tubular portal element. The opening is sealed by flattening the tubular element and rolling it upon itself substantially parallel to the longitudinal dimension of the opening. Fastening strips are provided to extend along the opposite sides of the longitudinal opening to provide a mechanical closure.